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Finding the Fourth Proportional to 153,238.61, 211,349.45 and 99,540.92

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Solution

The fourth proportional to 153,238.61, 211,349.45 and 99,540.92 is: 137,288.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,238.61 : 211,349.45 = 99,540.92 : x
  2. Step 2: Convert to fraction form
    153,238.61/211,349.45 = 99,540.92/x
  3. Step 3: Cross multiply
    153,238.61x = 211,349.45 × 99,540.92
  4. Step 4: Simplify right side
    153,238.61x = 21,037,917,140.04
  5. Step 5: Solve for x
    x = 21,037,917,140.04/153,238.61
  6. Step 6: Final answer
    x = 137,288.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.